package com.sky.aspect;

import com.fasterxml.jackson.databind.ser.Serializers;
import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDate;
import java.time.LocalDateTime;

/*
  *  自定义切面，实现自动填充功能
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*
     *  切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut(){}

    /*
     *  前置通知，实现自动填充功能
     */
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行数据填充....");
        //获得方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获得方法上的注解
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        //获得注解中的操作类型
        OperationType operationType = autoFill.value();
        //获取当前目标方法的参数
        Object[] args = joinPoint.getArgs();

        if(args == null || args.length == 0){
            return;
        }

        //实体对象
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long empId= BaseContext.getCurrentId();

        //insert和update的反射
        if(operationType == OperationType.INSERT){
            try{
                //获取set方法对象--Method
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateUser.invoke(entity, empId);
                setUpdateUser.invoke(entity, empId);
                setCreateTime.invoke(entity, now);
                setUpdateTime.invoke(entity, now);
            }catch (Exception e){
                log.error("自动填充失败",  e.getMessage());
            }
        }else if(operationType == OperationType.UPDATE){
            try{
                //获取set方法对象--Method
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setUpdateUser.invoke(entity, empId);
                setUpdateTime.invoke(entity, now);
            }catch (Exception e){
                log.error("自动填充失败",e.getMessage());
            }
        }
    }
}
